单项选择题
The cargo is now and（）found short during discharging at your port.
A.than B.then C.when the line pull reaches the breaking strengh of the fall D.while
单项选择题 The center of volume of the immersed portion of the hull is called the（）.
单项选择题 The collision bulkhead shall be of（）.
单项选择题 The deck control valve to be（）after being repaired.
